In the late 1840s, Francisco Marquez, the Mexican co-holder of the Rancho Boca de Santa Monica land grant given by his government, established a burial ground on the canyon's wide-open upper mesa. The cemetery contains the remains of Pascual, his youngest son, and perhaps 30 other family members, American Indian servants and friends -- including 13 guests who died of botulism after eating home-canned peaches at a New Year's Eve gathering in 1909. The last burial at the site was in 1916 and all the crosses designating burials had been removed by the mid 1930s. Surviving family members were able to estimate the location of one burial some years ago, and reconstructed the main Pascual Marquez burial on the site. All the other burials were never remarked.